RHfzOPODS. 129 



9. TrinIma :enchelys (Fig. 102). 



This shell is pouch-shaped, colorless, small, and in- 

 clined, so that when in motion with the mouth down- 

 ward against the slide the rounded summit is lifted 

 obliquely upward. It is somewhat nar- 

 rower at the lower part, and the mouth 

 is a short distance within the shell, the 

 front or lower edges seeming to curve 

 inward to meet it or to form it. The 

 body of the animal is colorless. The ^'^" J^ciTew"^"^ 

 pseudopodia are fine, thread-like and few, 

 three being the usual number visible at one time. 



The Rhizopod is common everywhere in wet places, 

 and is one of the smallest members of the group. The 

 shell is often found dead and empty. The figure shows 

 it in side view. The aperture of the shell is seen to 

 be beaded when examined with a'high-power objective. 



10. EtJGLYPHA (Fig. 103). 



The shell of FAglypha is ovoid, colorless, and trans- 

 parent. Under a high power -it is seen to be com- 

 posed of many oval or hexagonal plates arranged in 

 rows, those toward the widest part of the shell over- 

 Japping those in front. The mouth 

 is circular or oval, the projecting 

 points of the plates giving it a toothed, 

 saw-like edge. There are several 

 ■spe.cies, but they all may be known as 

 Euglyphse by this serrated or saw- 

 toothed mouth. The upper part and 

 the borders of the shell are either with 

 or without spines, or they may bear 

 fine short hairs. The animal itself is ^'^- XTuff.''''""'' 



